twitter this week, the social media phenom soared from the opening bell of its ipo. It's already transforming the political world. The roundtable set to weigh in on this after this from rick klein. Reporter: The biggest moment in twitter. Move over justin bieber, sorry prince george, you can't top the obamas. In tweet-craze washington, iowa senator chuck grassley. You think of your averag twitter -- I don't think a senator such as you come to mind. I'm 80 years old. Constituents ask -- tough talk. Sure? Tough to understand?Oh, yeah. Reporter: Then there's the family mouse time he informed the public about that thud he just heard on an iowa road. We hit a deer. Well, in iowa, you hit a deer and you assume it's dead. Reporter: All 100 senators have twitter accounts, as well as 97% of house members. And 49 of 50 governors. Twitter has launched careers, as with corey booker and it's ended them. Today I'm announcing my resignation from congress. Reporter: When marco rubio took an awkward swig of water on national television, his team knew the perfect response. They use twitter as an early warning sign and a valuable outlet. One of the most important ways to get your message out. Reporter: Especially when you're a senator with vital information to disseminate. Let's see, tweet there I'm being interviewed by abc. Reporter: For "this week," I'm rick klein. That's @rickklein. Thank you, rick klein. Whether or not twitter is helping or hurting politics, helping or hurting journalism? Keith ellison, active user. First thing I have to say, @keithellison, follow me. It's a good way to get a message out and get feedback. If you send out a press release that's a one-way thing, twitter I tweeted the president about minimum wage, and we had a lively discussion. And we also saw in the last presidential election, john, the explosion of coverage on twitter. The main thing it's done more than anything, it's the latest in a succession of technologies that has sped up the news cycle. All of them, all it's done, we talked about the 24-hour news cycle, now we have a second by second news cycle. I don't know if it's good or bad for politics, but it's changed politics. Not only has it sped up the news cycle, but also reinforces this tendency to chase after the brightest new object out there. It's amazing how rapidly it is. I don't tweet myself but i follow it. It means sometimes it's a shooting star. And within 24 hours, everybody has tweeted and they're all, saying, well, move on. It does, though, I do not tweet. And have never -- I have never been on twitter. But, I do think it has the effect of making spinning less effective, because if somebody is trying to tell you after the debate for instance this is how it went, all of these people are saying something totally different. I think that, it's made spinning more effective and it's also made it more instant. You got to do more spinning now because you don't have nearly the time you had before you had to respond to a crisis. You have to do it immediately. It's also a great tool to reach young people. You know, I mean, I hate to break it to you, young people aren't watching tv. You're exactly right. Because they're seeing it through links on twitter. They have academic studies on it that show it has contributed to polarization. Thank you all very much. That's the last word today. That was great roundtable. Up next, canadian tv star

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